CN(C)S(=O)(=O)c1ccc2cncc(NC(=O)C3CCOc4ccc(Cl)cc43)c2c1
CNS(=O)(=O)c1ccc2cncc(NC(=O)C3CCOc4ccc(Cl)cc43)c2c1
NS(=O)(=O)c1ccc2cncc(NC(=O)C3CCOc4ccc(Cl)cc43)c2c1
Sulfonamide as alternative to sulfone substituent on the IQ ring. Less electron withdrawing than sulfone (?), and therefore less reduction of the basicity of the IQ nitrogen.